JP2014199325A - Housing structure of optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing structure of optical equipment capable of preventing the inside of the optical equipment becoming a state of high humidity and capable of surely preventing dew condensation of an optical window.SOLUTION: A housing structure of optical equipment includes: optical storage space 2 for storing optical equipment; control storage space 3 for storing control equipment for controlling the optical equipment; and semi-hermetic partition wall 4 having humidity permeability and partitioning the optical storage space 2 and the control storage space 3. Humidity in the control storage space 3 is not immediately permeated to the optical storage space 2, and dew condensation of the optical equipment can be surely prevented by suppressing the increase of the humidity in the optical storage space 2.

Description

  The present invention relates to a housing structure of an optical device, and in particular, it can prevent the inside of the optical device from being in a high humidity state, and can reliably prevent dew condensation on the optical window. It relates to body structure.

  Conventionally, as an actuator having a structure in which a plate-like movable part is pivotally supported on a frame-like fixed part, for example, using a semiconductor manufacturing technique, a silicon substrate is anisotropically etched to form a frame-like fixed part. A plate-like movable part and a support beam that pivotally supports the movable part are integrally formed on the fixed part, a drive coil is provided on the movable part, and a static magnetic field is applied to the drive coil of the movable part, such as a permanent magnet An electromagnetically driven planar actuator is provided that has a static magnetic field generating means and swings a movable part using Lorentz force generated by the interaction between the magnetic field generated in the drive coil by energization and the static magnetic field generated by the static magnetic field generating means. Many are used. Such an actuator is applied to an optical device such as an optical scanner that deflects and scans a light beam by providing a mirror on a movable part.

  In such an optical apparatus, an optical window made of glass or the like is provided for irradiating a light beam and receiving reflected light of the light beam, and this optical window reduces the external temperature of the optical apparatus. May cause condensation. Among such optical devices, in an optical device that can ensure a relatively large volume of the casing, the heat generated inside the device is easily dispersed, so even if the outside air temperature is somewhat lowered, the optical window Inside, the dew point is difficult to reach and condensation does not occur.

  However, in optical devices that require miniaturization, the internal heat generation of optical devices tends to increase due to high-density mounting and insufficient heat dissipation, and the moisture absorbed by the substrate and resin members inside the device due to this heat generation. Will be released and the inside will become hot and humid. As a result, there is a problem that the optical window of the optical device is likely to be condensed.

  As a technique for preventing the condensation of such an optical device, conventionally, for example, a humidity control material is installed inside a housing of an optical device such as a surveillance camera used indoors or outdoors, and the humidity control material absorbs water vapor. And a technique for preventing dew condensation inside the optical apparatus by repeating the discharge (for example, see Patent Document 1).

JP 2005-334738 A

  However, in the technique described in Patent Document 1, the humidity inside the optical device is adjusted by the humidity control material. However, if the humidity control material is simply built in the optical device, the inside of the optical device is not limited. When heat is released due to heat generation and the temperature and humidity become high, moisture may not be absorbed in time, and there is a problem that dew condensation on the optical window of the optical device cannot be reliably prevented.

  The present invention has been made in view of the above points, and can provide a housing for an optical device that can prevent the inside of the optical device from being in a high humidity state and can reliably prevent condensation of the optical window. The purpose is to provide a structure.

  In order to achieve the above object, according to the present invention, a housing structure of an optical device according to the invention of claim 1 includes an optical storage space for storing the optical device and a control storage space for storing a control device for controlling the optical device. And a semi-sealed partition wall having moisture permeability and partitioning the optical storage space and the control storage space.

  The invention according to claim 2 is characterized in that, in claim 1, the semi-hermetic partition is made of a resin having moisture permeability.

  According to a third aspect of the present invention, in the first or second aspect, a humidity control material is provided in the optical storage space.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the control storage space includes a moisture release portion communicating with the outside through a moisture permeable membrane. To do.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the semi-sealed partition wall is provided with a moisture-proof coating.

  According to the first aspect of the present invention, the optical storage space for storing the optical device, the control storage space for storing the control device, the semi-sealed partition wall having moisture permeability and partitioning the optical storage space and the control storage space. Therefore, moisture in the control storage space is not immediately transmitted to the optical storage space, and dew condensation on the optical device can be reliably prevented by suppressing an increase in the humidity of the optical storage space. .

  According to the second aspect of the present invention, since the semi-sealed partition is made of a resin having moisture permeability, the semi-sealed partition does not immediately transmit moisture in the control storage space to the optical storage space. By suppressing the increase in the humidity of the optical storage space, it is possible to reliably prevent condensation of the optical device.

  According to the third aspect of the present invention, since the humidity control material is provided in the optical storage space, the moisture in the optical storage space is absorbed or released by the moisture absorbing material. The internal humidity can be kept constant, eliminating the need for life and replacement due to the moisture absorption capacity of the hygroscopic material. Can be suppressed. In addition, the semi-sealed partition and humidity control material can maintain the internal humidity of the optical storage space to the extent that condensation does not occur, so there is no need to completely separate the optical storage space from the control storage space. Wiring and the like routed between the storage space and the control storage space can be easily performed, the design can be simplified, the manufacturing cost can be reduced, and the decomposability can be improved.

  According to the fourth aspect of the present invention, since the moisture storage portion communicating with the outside through the moisture permeable membrane is provided in the control storage space, when the external humidity is lower than the internal humidity of the control storage space The moisture inside the control storage space can be released to the outside by the moisture releasing portion.

  According to the fifth aspect of the present invention, since the moisture-proof coating is applied to the semi-hermetic partition wall, moisture penetration from the control storage space to the optical storage space can be further prevented by the moisture-proof coating.

It is a schematic block diagram which shows embodiment of the housing structure of the optical device which concerns on this invention. It is explanatory drawing which shows the experimental result which measured the temperature and humidity in the optical storage space in embodiment of the housing structure of the optical device which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing an embodiment in which the housing structure of an optical device according to the present invention is applied to a distance image sensor having a planar actuator.

  As shown in FIG. 1, the housing structure of the optical device of the present embodiment includes a box-shaped housing 1. One side of the housing 1 has, for example, a planar actuator (optical device). There is provided an optical storage space 2 in which (not shown) is stored. In addition, a control storage space 3 in which a control device for controlling the planar actuator is stored is provided on the other side of the housing 1, and between the optical storage space 2 and the control storage space 3 is provided. A semi-hermetic partition wall 4 is provided for partitioning the two. The semi-hermetic partition wall 4 is made of, for example, a material having moisture permeability such as resin, and does not immediately transmit moisture in the control storage space 3 to the optical storage space 2, but gradually with time. It has the characteristic of permeating moisture. The surface of the semi-hermetic partition wall 4 may be provided with a moisture-proof coating. By applying the moisture-proof coating in this way, it is possible to further prevent moisture from entering the optical storage space 2 from the control storage space 3.

In addition, a transparent optical window 5 is provided on the end surface of the housing 1 on the side of the optical storage space 2 for light emission and reception by an optical device. Material 6 is installed. The humidity control material 6 has a characteristic of maintaining the humidity at about 60%, and the humidity control material 6 has a function of repeatedly performing moisture absorption and moisture release in order to maintain the humidity. Furthermore, a moisture release portion 7 communicating with the outside through a moisture permeable membrane is provided on both sides of the control storage space 3 of the housing 1, and the moisture release portion 7 is a moisture inside the control storage space 3. Is released to the outside.
Next, the operation of this embodiment will be described.

  Usually, the control storage space 3 contains a control device, and this control device contains a large amount of resin material, which causes the control device to generate moisture. Therefore, by separating the control storage space 3 and the optical storage space 2 by the semi-sealed partition wall 4, it is possible to temporally suppress the moisture generated by the control device from entering the optical storage space 2. .

  In this case, since the semi-hermetic partition 4 is not completely sealed, moisture enters the optical storage space 2 from the control storage space 3 over time. However, since the humidity control material 6 is provided inside the optical storage space 2, moisture entering the optical storage space 2 from the control storage space 3 is absorbed by the humidity control material 6, and the optical storage space 2 It becomes possible to keep the internal humidity constant.

  When the control device is operated, the control device generates heat. Therefore, when the relative humidity is reduced within the control storage space 3 to be lower than the internal humidity of the optical storage space 2, the inside of the optical storage space 2 is increased. Moisture gradually enters the control storage space 3 through the semi-hermetic partition wall 4, and the internal humidity of the optical storage space 2 decreases.

  In this case, when the humidity of the optical storage space 2 decreases, the humidity adjusting material 6 releases the accumulated moisture, and the humidity inside the optical storage space 2 can be appropriately maintained by the humidity adjusting material 6. Is. As described above, the humidity conditioner 6 has a function of repeatedly absorbing and releasing ambient humidity, so that the life and replacement due to the moisture absorption capacity of the moisture conditioner become unnecessary, and even in long-term use, the humidity conditioner 6 can be adjusted. The wet material 6 can suppress the application amount to a very small amount as compared with the hygroscopic material.

  Further, when the external humidity is lower than the control storage space 3, the moisture in the control storage space 3 is released to the outside through the moisture release unit 7.

  FIG. 2 shows the experimental results of measuring the temperature and humidity in the optical storage space 2 by installing the casing 1 with the planar actuator in an atmosphere having an ambient temperature of 25 ° C. and an ambient humidity of 95%. It is.

  In this case, when the casing 1 is left for two days, the humidity in the control storage space 3 gradually enters the optical storage space 2 due to the semi-sealed partition wall 4, so that the humidity in the optical storage space 2 gradually increases. To do.

  When the control device is operated, the temperature of the control device rises to temporarily increase the humidity of the optical storage space 2. However, the humidity is absorbed by the humidity control material 6, thereby significantly increasing the humidity. Can be suppressed. As the temperature of the control device rises, the internal humidity of the control storage space 3 begins to decrease relatively, and the humidity of the optical storage space 2 also decreases accordingly.

  Then, when the operation of the control device is stopped, the temperature of the control device decreases, so the humidity in the optical storage space 2 relatively increases. However, when the control device is operated again, the humidity starts to decrease. As described above, according to the results of this experiment, the internal humidity of the optical storage space 2 can be suppressed to a certain level or less, and in general, condensation occurs at a humidity of 80% or more. In the embodiment, it can be seen that the internal humidity of the optical storage space 2 can be suppressed to about 65% or less, and the occurrence of condensation on the optical window 5 can be prevented.

  As described above, in the present embodiment, the semi-sealed partition wall 4 is provided between the optical storage space 2 and the control storage space 3 so that moisture in the control storage space 3 is immediately optically transmitted. By preventing the optical storage space 2 from rising without being transmitted through the storage space 2, dew condensation on the optical device can be reliably prevented.

  Further, a moisture absorbing material is provided in the optical storage space 2, and the moisture inside the optical storage space 2 is absorbed or released by the moisture absorbing material, so that the internal humidity of the optical storage space 2 is kept constant. Therefore, the life and replacement due to the moisture absorption capacity of the moisture absorbent material become unnecessary, and even when the humidity control material 6 is used over a long period of time, the application amount can be suppressed to a very small amount compared to the moisture absorbent material. Moreover, since the internal humidity of the optical storage space 2 can be maintained to such an extent that no condensation occurs by the semi-sealed partition wall 4 and the humidity control material 6, the optical storage space 2 and the control storage space 3 are completely airtightly partitioned. This eliminates the need for easy wiring and wiring between the optical storage space 2 and the control storage space 3, simplifies the design, reduces manufacturing costs, and improves resolvability. You can plan.

  Further, since the moisture release portions 7 communicating with the outside through the moisture permeable membrane are provided on both sides of the control storage space 3 of the housing 1, moisture inside the control storage space 3 can be provided by the moisture release portion 7. Can be released to the outside. Also. By applying a moisture-proof coating to the surface of the semi-hermetic partition wall 4, it is possible to further prevent moisture from entering the optical storage space 2 from the control storage space 3.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible based on the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Case 2 Optical storage space 3 Control storage space 4 Semi-hermetic partition 5 Optical window 6 Humidity control material 7 Moisture release part

Claims (5)

An optical storage space for storing optical equipment;
A control storage space for storing a control device for controlling the optical device;
A semi-hermetic partition wall having moisture permeability and partitioning the optical storage space and the control storage space;
A housing structure for an optical device, comprising:   2. The housing structure for an optical device according to claim 1, wherein the semi-hermetic partition wall is made of a resin having moisture permeability.   The optical device housing structure according to claim 1, wherein a humidity control material is provided in the optical storage space.   The housing of the optical device according to any one of claims 1 to 3, wherein the control storage space includes a moisture release portion that communicates with the outside through a moisture permeable membrane. Construction.   The housing structure for an optical device according to any one of claims 1 to 4, wherein the semi-sealed partition wall is provided with a moisture-proof coating.

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